To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.

From Wikipedia, the free encyclopedia

Type Turbojet
Manufacturer Tumansky
Major applications Mikoyan-Gurevich MiG-25
Tupolev Tu-123

The Tumansky R-15 is an axial flow, single shaft turbojet with an afterburner. Its best known use is on the Mikoyan-Gurevich MiG-25.

Design and development

The R-15-300 was designed at the OKB-300 design bureau led by Sergei Tumansky in the late 1950s. The engine was originally intended for the Tupolev Tu-121 high-altitude high-speed cruise missile. Due to a lack of Soviet resources and funding the engine casing was mainly steel, and in areas exposed to high temperatures, 30 micrometre silver-plated steel. At the time, the USSR did not have the resources to exploit metals such as titanium or other alloys which could have reduced the weight of the engine. The Tu-121 was later canceled, but its basic design was used in the Tupolev Tu-123 reconnaissance drone.


The maximum thrust was 7,500 kilograms force (73.5 kN, 16,500 lbf) dry and 11,200 kilograms force (110 kN, 24,700 lbf) with afterburner. This thrust enabled the Mikoyan-Gurevich MiG-25, with two engines, to reach mach 3.2, although the engines had to be scrapped after a flight to Mach 3.2. The engine had a very high fuel consumption, especially at low altitudes.


  • R-15-300: Original version. Used in Tupolev Tu-123 Yastreb drone.
  • R-15-300M
  • R-15B-300: Electronic engine controls (the first for the Soviet engine). and modifications to increase life span. Original engine for the MiG-25P, MiG-25R and variants.
  • R-15BD-300: Improved and more powerful version for MiG-25PD and MiG-25PDS. Engine Lifespan increased up to 1000 Hours.[1]
  • R-15BF2-300: Uprated version. Used in Ye-266M high-performance MiG-25M prototype. MiG-25M aircraft was never put into production


Specifications (R-15B-300)

General characteristics

  • Type: Afterburning turbojet
  • Length: 6,264 mm (246.6 in)
  • Diameter: 1,512 mm (59.5 in)
  • Dry weight: 2,454 kg (5,410 lb)




External links

This page was last edited on 27 January 2021, at 20:38
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.